The National Pipeline Mapping System (NPMS) is a dataset containing locations of and information about gas transmission and hazardous liquid pipelines and Liquefied Natural Gas (LNG) plants which are under the jurisdiction of the Pipeline and Hazardous Materials Safety Administration (PHMSA). The NPMS also contain voluntarily submitted breakout tank data. The data is used by PHMSA for emergency response, pipeline inspections, regulatory management and compliance, and analysis purposes. It is used by government officials, pipeline operators, and the general public for a variety of tasks including emergency response, smart growth planning, critical infrastructure protection, and environmental protection.

Please note that the spatial accuracy of pipeline data in the NPMS is +/-500 feet. Therefore,
the NPMS should never be used as a substitute for calling
811 before digging or excavating. Distribution and gathering pipelines are not included in the NPMS.
For an overview of the NPMS website functionality, please refer to the NPMS brochure.
Please visit the FAQ page if you have further questions, or you may Contact Us.